its a type of flow chart
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Sankey diagrams are a type of flow diagram that describes the flow of resources proportional to the flow quantity. It is used in many industries and used to highlight necessary flows. Disadvantages of Sankey Diagram: Audiences who don't have enough idea on data visualization feel difficulty in understanding Sankey diagrams. Sankey diagrams make it hard to understand the flows of similar widths. This diagram requires a long explanation as everyone is not familiar with it.
graphical representations
An advantage to using graphs and diagrams in presentations is that it is easy for your audience to see what you are describing. Graphs and diagrams help get your point across.
UML 2.4 has 14 types of diagrams divided into two categories: Structure diagrams and Behavior diagrams.Structure diagrams show the static structure of the system and it's parts on different abstraction and implementation levels and how they are related to each other.Structure diagrams are:Class diagramObject diagramPackage diagramComponent diagramComposite structure diagramDeployment diagramProfile diagramBehavior diagrams show the dynamic behavior of the objects in a system, which can be described as a series of changes to the system over time.Behavior diagrams are:Use case diagramActivity diagramState machine diagramSequence diagramCommunication diagramInteraction overview diagramTiming diagramSequence diagram, Communication diagram, Interaction overview diagram, and Timing diagram are Interaction diagrams.Note, that though Use case diagram is Behavior diagram, it is also special case of Class diagrams (which are Structure diagrams).
UML 2.3 and the more recent UML 2.4 has 14 types of diagrams: 7 structure diagrams and 7 behavior diagrams. See the overall hierarchy and description of each type in the provided link.